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Home >> Mercury >> 1980 >> Bobcat Villager, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Feedback Carburetor Electronic Engine Control System >> Operation >> Cold Temperature Vacuum Switch (CTVS)
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Cold Temperature Vacuum Switch (CTVS)

The CTVS is used on Automatic Transmission equipped models. It is a normally closed vacuum switch, connected to a Ported Vacuum Switch (PVS). As coolant temperature rises above 125°F, the coolant PVS switches, allowing vacuum to the CTVS and signalling the MCU into the "closed loop" mode.

Fig 1: Cold Temperature and Throttle Angle Vacuum Switch
G09339822Courtesy of FORD MOTOR CO.
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